SIST I-ETS 300 245-2 E1:2003

SLOVENSKI STANDARD
01-december-2003
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Integrated Services Digital Network (ISDN); Technical characteristics of telephony
terminals; Part 2: PCM A-law handset telephony
Ta slovenski standard je istoveten z: I-ETS 300 245-2 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN I-ETS 300 245-2
TELECOMMUNICATION May 1994
STANDARD
Source: ETSI TC-TE Reference: T/TE 10-07 (B)
ICS: 33.020, 33.040.40
ISDN, telephony terminals, handset function
Key words:
Integrated Services Digital Network (ISDN);
Technical characteristics of telephony terminals
Part 2: PCM A-Law handset telephony
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1994. All rights reserved.
New presentation - see History box

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I-ETS 245-2: May 1994
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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I-ETS 245-2: May 1994
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 Call control functions.9
5 Transmission aspects .9
5.1 General .9
5.1.1 Encoding .9
5.1.2 Relative level .9
5.1.3 Volume control .9
5.2 Speech performance characteristics .9
5.2.1 Frequency response and sensitivity .9
5.2.1.1 Sending.9
5.2.1.2 Receiving.10
5.2.2 Volume control .11
5.2.3 Sidetone .11
5.2.3.1 Talkers sidetone .11
5.2.3.2 Listeners sidetone.12
5.2.4 Terminal Coupling Loss (TCL) .12
5.2.4.2 Weighted Terminal Coupling Loss (TCLw).12
5.2.4.2 Stability loss.12
5.2.5 Distortion .12
5.2.5.1 Sending.12
5.2.5.2 Receiving.12
5.2.5.3 Sidetone.12
5.2.6 Variation of gain with input level.13
5.2.6.1 Sending.13
5.2.6.2 Receiving.13
5.2.7 Out-of-band signals.13
5.2.7.1 Discrimination against out-of-band input signals (Sending) 13
5.2.7.2 Spurious out-of-band signals (Receiving).13
5.2.8 Noise .13
5.2.8.1 Sending.13
5.2.8.2 Receiving.14
5.2.8.3 Level of sampling frequency (Receiving).14
5.2.9 Acoustic shock .14
5.2.10 Delay .14
5.3 Non-linear devices .14
6 Power feeding .14
6.1 General conditions.14
7 Physical modules .14
7.1 Handset.14
7.2 Audible alerting module .14

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I-ETS 245-2: May 1994
Annex A (normative): Test specifications . 15
A.1 General conditions for testing. 15
A.2 Sidetone. 15
A.2.1 Talker sidetone. 15
A.2.2 Listener sidetone. 15
A.3 Weighted terminal coupling loss. 16
A.4 Delay. 16
Annex B (informative): Acoustic shock requirements. 18
B.1 Continuous signal . 18
B.2 Peak signal . 18
Annex C (informative): Bibliography . 18
History. 19

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I-ETS 245-2: May 1994
Foreword
This Interim European Telecommunication Standard (I-ETS) was prepared by the Terminal Equipment
(TE) Technical Committee of the European Telecommunications Standards Institute (ETSI).
An ETSI standard may be given I-ETS status as it is regarded either as a provisional solution ahead of a
more advanced standard, or because it is immature and requires a "trial period". The life of an I-ETS is
limited, at first, to three years after which it can be converted into an European Telecommunication
Standard (ETS), have its life extended for a further two years, be replaced by a new version of the I-ETS
or, finally, be withdrawn.
This is the second part of an I-ETS which is currently intended to comprise eight parts.
This I-ETS specifies technical characteristics for Integrated Services Digital Network (ISDN) telephony
terminals as described in the scope of this I-ETS. The characteristics are additional to type approval
requirements to which the terminal equipment is subject. The additional characteristics are meant to give
improved performance.
In the present version of this I-ETS the following parts are included:
Part 1: General (I-ETS 300 245-1 [1]).
Part 2: PCM A-law, handset telephony.
Part 3: PCM A-law, loudspeaking and handsfree telephony.
Part 4: Interface for additional equipment.
Part 5: Wideband (7 kHz) handset telephony.
Part 6: Wideband (7 kHz) handsfree telephony.
Part 7: Locally generated information tones.
Part 8: Terminal application of 16 kbit/s speech coding algorithms.
NOTE: Part 8 is still under study within ETSI.

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I-ETS 245-2: May 1994
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I-ETS 245-2: May 1994
1 Scope
This Part of this Interim European Telecommunication Standard (I-ETS) specifies the technical
characteristics for Pulse Code Modulation (PCM) A-law 3,1 kHz handset telephony terminals to be used at
the basic access for the coincident S and T reference point of the Integrated Services Digital Network
(ISDN).
This Part applies in conjunction with I-ETS 300 245-1 [1] and the characteristics specified in this Part are
additional to those of I-ETS 300 245-1 [1].
The present version of this part does not cover measurements on receivers (in handsets) with low acoustic
output impedance.
NOTE: The characteristics specified in this I-ETS are supplementary to the mandatory
requirements given in ETS 300 085 [2].
2 Normative references
This I-ETS incorporates by dated or undated reference, provision from other publications. These normative
references are cited at the appropriate places in the text and the publications are listed hereafter. For dated
references, subsequent amendments to or revisions of any of these publications apply to this I-ETS only
when incorporated in it by amendment or revision. For undated references the latest edition of the publication
referenced to applies.
[1] I-ETS 300 245-1 (1994): "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals, Part 1 - General".
[2] ETS 300 085 (1990): "Integrated Services Digital Network (ISDN); 3,1 kHz
telephony teleservice, Attachment requirements for handset terminals".
[3] CCITT Recommendation P.10 (1988): "Vocabulary of terms on telephone
transmission quality and telephone sets".
[4] CCITT Recommendation G.701 (1988): "Vocabulary of digital transmission and
multiplexing, and pulse code modulation (PCM) terms".
[5] ETS 300 111 (1992): "Integrated Services Digital Network (ISDN); Telephony
3,1 kHz teleservice, Service description".
[6] CCITT Recommendation G.122 (1988): "Influence of national systems on
stability, talker echo and listener echo in international connections".
[7] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[8] CCITT Recommendation G.101 (1988): "The transmission plan".
[9] ITU-T Recommendation P.79 (1993): "Calculation of loudness ratings".
[10] IEC 225: "Octave, half-octave and third-octave band filters intended for the
analysis of sound and vibrations".
[11] CCITT Recommendation P.64 (1988): "Determination of sensitivity/frequency
characteristics of local telephone systems to permit calculation of their loudness
ratings".
[12] ISO 3 (1973): "Preferred numbers - Series of preferred numbers".

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I-ETS 245-2: May 1994
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this I-ETS, the relevant definitions given in CCITT Recommendations P.10 [3] and G.701
[4] apply along with the following.
Telephony 3,1 kHz teleservice: A description of the telephony 3,1 kHz teleservice is to be found in ETS 300
111 [5].
Loudspeaking telephony terminal: A handset telephony terminal using a loudspeaker associated with
an amplifier as a telephone receiver. Defined in CCITT Recommendation P.10 [3].
Handsfree telephony terminal: A telephony terminal using a loudspeaker associated with an amplifier as
a telephone receiver and which can be used without a handset. Defined in CCITT Recommendation P.10
[3].
Terminal Coupling Loss (TCL): The frequency dependent coupling loss between the receiving port and
sending port of a terminal due to:
- acoustic coupling at the user interface;
- electrical coupling due to crosstalk in the handset cord or within the electrical circuits;
- seismic coupling through the mechanical parts of the terminal.
NOTE 1: The receiving port and the sending port of a digital voice terminal is a 0 dBr point.
NOTE 2: The coupling at the user interface will depend on the conditions of use.
Weighted Terminal Coupling Loss (TCLw): The weighted TCL using the weighting of CCITT
Recommendation G.122 [6].
Digital interface: For the purposes of this I-ETS, the digital interface refers to the B-channels available at
the coincident S and T reference point at an ISDN basic access.
3.2 Abbreviations
For the purposes of this I-ETS, the relevant abbreviations in CCITT Recommendations P.10 [3] and G.701
[4] apply.
ERP Ear Reference Point, see CCITT Recommendation P.10 [3]
ETS European Telecommunication Standard
ETSI European Telecommunications Standards Institute
I-ETS Interim European Telecommunication Standard
ISDN Integrated Services Digital Network
LRGP Loudness Rating Guard-ring Position
LSTR Listener Side Tone Rating
MRP Mouth Reference Point, see CCITT Recommendation P.10 [3]
PCM Pulse Code Modulation
RLR Receiving Loudness Rating
SLR Sending Loudness Rating
STMR Side Tone Masking Rating
TCL Terminal Coupling Loss
TCLw weighted Terminal Coupling Loss

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I-ETS 245-2: May 1994
4 Call control functions
The requirements of I-ETS 300 245-1 [1] shall be met.
5 Transmission aspects
5.1 General
Recommendations and requirements for PCM A-law terminals are given here and in ETS 300 085 [2]. When
using other coding algorithms other parts of this I-ETS may apply.
5.1.1 Encoding
The default speech encoding algorithm for all telephony terminals shall be the A-law encoding at 64 kbit/s as
defined in CCITT Recommendation G.711 [7]. Any other possible encoding algorithm will be additional. For
some encoding algorithms recommendations are given in other parts of this I-ETS.
5.1.2 Relative level
The digital interface is defined as a 0 dBr point according to CCITT Recommendation G.101 [8].
5.1.3 Volume control
Unless stated otherwise, the requirements apply for all positions of the user-controlled receiving volume
control, if provided.
5.2 Speech performance characteristics
5.2.1 Frequency response and sensitivity
The frequency responses and sensitivities shall be measured as described in ETS 300 085 [2].
5.2.1.1 Sending
Requirements for the sending sensitivity (Sending Loudness Rating (SLR)) are given in ETS 300 085 [2].
The frequency response (from Mouth Reference Point (MRP) to digital interface) shall be within the limits
restricted by the fully drawn lines in figure 1.
In figure
...